Backfill: An Efficient Header Compression Scheme for OpenFlow Network with Satellite Links
Backfill: An Efficient Header Compression Scheme for OpenFlow Network with Satellite Links
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Backfill：一种用于卫星链路 OpenFlow 网络的高效标头压缩方案
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Jian Cai
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文献类型：
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作者：
Yukun Niu;Chaobiao Wu;Lingbo Wei;Bin Liu;Jian Cai
首部压缩能够有效提高带宽利用率，尤其是在带宽有限的卫星链路中。现有的首部压缩方案对网络层的分组首部进行压缩。在OpenFlow网络中，由于可以基于输入端口、IP/MAC地址等动态部署转发规则，MAC首部可在路由中发挥作用。此外，在OpenFlow网络中并非每一跳都需要改变MAC首部。因此，我们假设OpenFlow网络中的MAC首部也通过卫星链路传输。在这种情况下，我们也可以在分组通过卫星链路传输之前对MAC首部进行压缩。因此，我们提出回填方案，对具有卫星链路的OpenFlow网络中从MAC首部开始的分组首部进行压缩。在该方案中，我们在生成上下文标识符（CID）之后将其放回现有的帧格式中。OpenFlow网络使路由首部压缩的分组成为可能。考虑了三种流量模式（MAC/IP/TCP、MAC/IP/UDP、MAC/IP/UDP/RTP）。对IPv4和IPv6都进行了测试，对于所考虑的流量类型，可以获得较高的首部压缩率（IPv4超过86%，IPv6超过89%）。结果表明，回填方案比其他首部压缩方案具有更高的首部压缩率。
Header compression can effectively improve the bandwidth utilization, especially in satellite links which have limited bandwidth. The existing header compression schemes compress packet headers from network layer. In OpenFlow network, MAC header can play a role in routing since forwarding rules can be dynamically deployed based on input port, IP/MAC addresses etc. Moreover, it is not necessary to change MAC header in every hop in OpenFlow network. Thus, we assume MAC header in OpenFlow network is also transmitted through satellite links. In this case, we can also compress MAC header before packets are transmitted through satellite links. Therefore, we propose backfill scheme to compress packet headers from MAC header in OpenFlow network with satellite links. In the scheme, we get context identifier (CID) back to the existing frame format after generating it. OpenFlow network makes it possible to route header-compressed packets. Three kinds of traffic patterns are considered (MAC/IP/TCP, MAC/IP/UDP, MAC/IP/UDP/RTP). Both IPv4 and IPv6 are tested, and higher header compression ratios (more than 86% for IPv4 and 89% for IPv6) can be obtained for the considered kinds of traffic. The results show that backfill has higher header compression ratios than other header compression schemes.